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BIO26 Chapter 13

BIO26 Chapter 13 - Chapter 13 U r ine is formed by Nephrons...

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Chapter 13. Urine is formed by Nephrons in the kidneys 1. Urine formed by the kidneys is channeled through the ureters to the urinary bladder, and out of the urinary bladder in the urethra. 2. Two sphincter are responsible for urination, called micturition, which is controlled by a reflex center in the sacral regions of the spinal cord, stimulates contraction of the detrusor muscle of the bladder and relaxation of the internal urethral sphincter via activation of parasympathetic neurons. 3. Each nephron consists of tubules and associate blood vessels. a. The glomerular capsule filtration of blood to form urine b. Proximal tubule receieves the filtrate from the glomerular capsule. The proximal tubules located in the renal cortex. c. The loop of henle receieves fluid from the proximal tubule, i. The descending limb, takes the fluid from the cortex into the medulla, ii. Ascending limb returns the cortex. iii. Distal convoluted tubule receives fluid from the ascending lip iv.
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